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On Thursday, April 18, 2019 07:31:13 PM DK1IS wrote:
SNIP
> Anyway, the idea is fascinating. Having no VLF crystals up to now, I
> made some preliminary tests with a randomly available HC-6-U quartz, QRG
> 2434 kHz, wavelength 123 m. And yes, it works!
>
> * TX: Sythesizer Schomandl MG100M, 300 Hz ... 100 MHz, smallest step
> 0.1 Hz, Ri = 50 Ohms, P = 10 dBm, output tied to first leg of
> quartz, alternatively direct to the antenna wire
> * RX: Perseus SDR with an active rod antenna on my garage, fed by a
> solar system, no external wire connections, air-line distance 100 m
> to my shack
> * Antena wire: 2 m or 4 m, laid out in the shack, tied to second leg
> of quartz, alternatively direct to the TX output
>
> Results with 2 m antenna wire:
>
> * with quartz resonator: fres = 2,433,908.8 Hz, RX level at resonance
> = - 63,1 dBm, - 3dB-bandwidth = 48.3 Hz resulting in Q = 50391
> * without quartz resonator: RX level = - 85,4 dBm resulting in a gain
> of 22.3 dB with quartz
> * comparision: my 13 m T-Marconi with top load 4 x 33 m, tuned to 2434
> kHz and fed by the synthesizer with 10 dBm results in a RX level of
> - 32.1 dBm ;-)
63.1 dBm - 32.1 dBm = 31.0 dB : the quartz adapted antenna radiated power is 1/1000 respect the T-Marconi, so the efficiency is 0.1%
Good DX ;-)
Claudio, IK2PII
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